Mechanical Operations
During the washing of cake

Cake resistance decreases
Filter medium resistance decreases
All the resistances are constant
Filter medium resistance increases

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Mechanical Operations
Work index is defined as the

Energy needed to crush one ton of feed to 100 microns
Energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen
Energy needed to crush one tonne of feed to 200 microns
Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen

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